Fig. 4.

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Energy dependence of QPEs in the observation Obs2 of eRO-QPE1 (related to the light curve shown in Fig. 3). The times tstart and tpeak are shown in hours elapsed from tObs2, 0. QPEs start earlier at lower energies (top panel) and evolve more slowly in terms of rise and decay (middle panel), and peak at later times (bottom panel) at low energies.
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